Heat garlic in skillet in 1 tbsp of olive oil over medium heat. Remove sausage from casing and add to skillet.
Cook sausage until cooked through. Set aside.
Heat up 1 1/2 tsp olive oil in pan over medium heat. Cook peppers until soft. Set aside. Add in remaining olive oil and heat over medium heat. Cook zucchini & squash until soft.
Return all ingredients to pan and heat through. Season with salt & pepper to taste.